JP2013178402A - Lens barrel and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a lens barrel.SOLUTION: The lens barrel comprises: a reference member; a cylindrical member fixed to the reference member and extended in a predetermined axis direction; a fitting part fitted to the cylindrical member; and a shaft part having an outer diameter smaller than that of the fitting part; a shaft member disposed in the cylindrical member and sliding in the predetermined axis direction; a holding member for supporting one end of the shaft member and holding an optical member guided in the predetermined axis direction by the sliding of the shaft member to the cylindrical member; and a bearing part contacting the shaft part of the shaft member to guide the shaft member in the predetermined axis direction.

Description

  The present invention relates to a lens barrel and an imaging device, and more particularly to a lens barrel that holds a plurality of lenses and an imaging device that includes the lens barrel.

  2. Description of the Related Art Conventionally, a lens barrel of a camera is mounted on an image pickup unit, a fixed tube fixed to the image pickup unit, a cam tube rotating with respect to the fixed tube, and an optical axis by rotation of the cam tube. A plurality of lens groups moving in the direction are provided (for example, see Patent Document 1).

JP 2000-89086 A

  Such a lens barrel has various design restrictions in order to ensure optical performance. In order to ensure optical performance under the restriction, the structure in the lens barrel should be simplified.

  Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lens barrel and an imaging apparatus that have a simplified structure.

  The lens barrel of the present invention includes a reference member (10), a cylindrical member (36A) fixed to the reference member and extending in a predetermined axial direction, and a fitting portion (30A2) fitted to the cylindrical member. A shaft member (30A1) having an outer diameter smaller than the outer diameter of the fitting portion, inserted into the cylindrical member, and slid in the predetermined axial direction; and the shaft member A holding member (12) that holds the optical member (L2) and that is guided in the predetermined axial direction by sliding the shaft member with respect to the cylindrical member, and contacts the shaft portion of the shaft member. And a bearing portion (43) for guiding the shaft member in the predetermined axial direction.

  In this case, a regulating member (30B) that extends in the predetermined axial direction, is in contact with or fixed to each of the holding member and the reference member, and regulates the movement of the holding member around the predetermined axis with respect to the reference member. The regulating member may have a length capable of continuing contact with at least one of the holding member and the reference member even when the holding member slides.

  In this case, the reference member includes an extending member (36B) extending in the predetermined axial direction, and either one of the cylindrical member and the extending member holds the second optical member (L3 to L5). The second holding member (13, 14) is used as a guide when moving in the predetermined axial direction, and the other of the cylindrical member and the extending member is in contact with the second holding member, The movement operation of the second holding member in the direction around the predetermined axis may be restricted.

  In this case, the extending member has a cylindrical shape, the restricting member has an axial shape, is fixed to the holding member, is inserted into the extending member, and the outer diameter of the restricting member is The inner diameter of the drawing member can be smaller.

  In the lens barrel of the present invention, the shaft portion may be located at one end supported by the holding member, and the fitting portion may be located at the other end.

  In the lens barrel of the present invention, the cylindrical member and the extending member may be disposed at positions that face each other by 180 degrees with respect to the optical axis of the lens barrel.

  The imaging device of the present invention is an imaging device including the lens barrel (100) and an imaging unit (200) that captures an image connected by the lens barrel.

  The lens barrel and the imaging device of the present invention have an effect that the structure can be simplified.

It is a figure which shows schematically the structure of the camera which concerns on one Embodiment. It is sectional drawing which shows the state which has a lens-barrel in a wide angle end. It is sectional drawing which shows the state in which the lens barrel was zoomed to the telephoto end. It is a figure which takes out and shows the vicinity of the 2nd group lens sliding cylinder. It is the sectional view on the AA line of FIG. It is a figure which shows the state which the 2nd group lens sliding cylinder moved from FIG. 4 to the front side. It is a figure which takes out and shows the 3rd, 5th group lens sliding cylinder, the 4th group lens sliding cylinder, and its vicinity. FIG. 8A is a diagram for explaining the first modification, and FIG. 8B is a diagram for explaining the second modification. Fig.9 (a) is a figure for demonstrating the modification 3, FIG.9 (b) is BB sectional drawing of Fig.9 (a). FIG. 10A is a diagram for explaining the fourth modification, and FIG. 10B is a cross-sectional view taken along the line CC of FIG. 10A. FIG. 11A is a diagram for explaining the fifth modification, and FIG. 11B is a diagram for explaining the sixth modification.

  Hereinafter, a camera according to an embodiment and a lens barrel included in the camera will be described in detail with reference to FIGS.

  FIG. 1 schematically shows a camera 500 according to an embodiment. As shown in FIG. 1, the camera 500 includes an imaging unit 200 and a lens barrel 100.

  The imaging unit 200 includes a housing 210, an optical system including a primary mirror 212, a pentaprism 214, and an eyepiece optical system 216 housed in the housing 210, a focus detection device 230, a shutter 234, and an image sensor 238. And a main LCD 240 and a main control unit 250.

  In the state of FIG. 1, the main mirror 212 guides most of the incident light incident from the lens barrel 100 to a focusing screen 222 disposed above. The focusing screen 222 is disposed at a focus position of the optical system in the lens barrel 100 and forms an image formed by the optical system in the lens barrel 100.

  The pentaprism 214 reflects the image formed on the focusing screen 222 and then guides it to the eyepiece optical system 216 via the half mirror 224. Thereby, the eyepiece optical system 216 can observe the image on the focusing screen 222 as a normal image. In this case, the half mirror 224 superimposes a display image formed on the finder LCD 226 indicating the shooting conditions, setting conditions, and the like on the image of the focusing screen 222. Accordingly, at the exit end of the eyepiece optical system 216, it is possible to observe a state in which the image on the focusing screen 222 and the image on the viewfinder LCD 226 are superimposed. A part of the light emitted from the pentaprism 214 is guided to the photometry unit 228, and the photometry unit 228 measures the intensity of the incident light, its distribution, and the like.

  The focus detection device 230 uses the light transmitted through the primary mirror 212 and reflected by the secondary mirror 232 provided on the back side of the primary mirror 212 to adjust the focus of the optical system in the lens barrel 100 ( Detect focus state. Note that the primary mirror 212 and the secondary mirror 232 are raised to a position indicated by a broken line in FIG. 1 so as to be retracted from the optical path of incident light incident from the lens barrel 100 at the time of photographing.

  The shutter 234 is disposed behind the primary mirror 212 (behind the optical path of incident light incident from the lens barrel 100), and performs an opening operation in conjunction with the ascending operation of the primary mirror 212 and the secondary mirror 232 at the time of shooting. Do. In a state where the shutter 234 is opened, incident light from the lens barrel 100 enters the image sensor 238 via the optical filter 236. The image sensor 238 converts an image formed by incident light into an electrical signal.

  The main LCD 240 has a display screen portion exposed to the outside of the housing 210. On the display screen of the main LCD 240, various setting information and the like in the imaging unit 200 are displayed in addition to the video (captured video) formed on the imaging device 238.

  The main control unit 250 comprehensively controls various operations of the respective units. The main control unit 250 drives the optical system (lenses L1 to L5) in the lens barrel 100 with reference to information on the focus adjustment state of the optical system detected by the focus detection device 230 in the imaging unit 200. (Autofocus), referring to the amount of operation of the optical system in the lens barrel 100, the fact that it is in focus is displayed on the finder LCD 226 (focus aid).

  Next, the configuration of the lens barrel 100 will be described in detail with reference to FIGS.

  2 and 3 are cross-sectional views of the lens barrel 100. FIG. Among these, FIG. 2 shows a state in which the lens barrel 100 is at the wide-angle end, and FIG. 3 shows a state in which the lens barrel 100 is zoomed to the telephoto end. As shown in these drawings, the lens barrel 100 includes a first group lens L1, a second group lens L2, a third group lens L3, a fourth group lens L4, and a fifth group lens L5 arranged on a common optical axis AX. . In the following description, the first group lens L1 side in the optical axis AX direction will be described as the front side, and the fifth group lens L5 side as the rear side.

  As shown in FIGS. 2 and 3, the lens barrel 100 includes a fixed barrel 10, a first group lens sliding cylinder 11 that holds the first group lens L1, and a second group lens sliding cylinder that holds the second group lens L2. 12, a third and fifth group lens sliding cylinder 13 holding the third group lens L3 and the fifth group lens L5, and a fourth group lens sliding cylinder 14 holding the fourth group lens L4.

  The fixed cylinder 10 is fixed to the imaging unit 200 at the base 10a. In this fixed state, the fixed cylinder 10, that is, the lens barrel 100 is in contact with the imaging unit 200 by the end surface 10 b of the fixed cylinder 10 on the imaging unit 200 side being in close contact with the imaging unit 200 (the casing 210 in FIG. 1). Positioned. The fixed cylinder 10 supports the guide pipe 36A at a pair of protrusions 33a and 33b provided near the upper part (ceiling part) of the inner peripheral surface, and is provided near the lower part of the inner peripheral surface. The guide pipe 36B is supported by the pair of protrusions 33c and 33d. These guide pipes 36A and 36B are disposed at positions facing each other by 180 degrees with respect to the optical axis (AX) of the lens barrel 100 (positions having substantially the same distance from the optical axis and facing each other across the optical axis). ing. As the material of the guide pipes 36A and 36B, a high-strength and lightweight material such as stainless steel can be used.

  The first group lens sliding cylinder 11 is connected to a zoom drive cylinder 16 provided inside the first group lens sliding cylinder 11 so as to be interlocked. Specifically, the cam pin 15 implanted in the first group lens sliding cylinder 11 is engaged with a cam groove 16 a formed in the zoom drive cylinder 16.

  On the other hand, the zoom drive cylinder 16 is connected to a zoom operation ring 18 that can freely rotate around the optical axis AX at the outermost periphery of the lens barrel 100. Specifically, a driving force transmission pin 19 projecting outward from the zoom driving cylinder 16 is engaged with an operation groove 18 a parallel to the optical axis AX formed on the inner surface of the zoom operation ring 18. Thereby, the zoom drive cylinder 16 rotates in conjunction with the rotation of the zoom operation ring 18. The zoom operation ring 18 cannot be moved in the front-rear direction, and an anti-slip rubber layer is provided on the outer peripheral surface thereof. The zoom operation ring 18 is rotated by the user during zooming.

  The zoom drive cylinder 16 is rotatable with respect to the zoom guide cylinder 22 provided on the inside thereof. As shown in the lower half of FIGS. 2 and 3, the zoom guide tube 22 is formed with a clearance groove 22 a, and the zoom guide tube 22 and the straight advance groove 16 b formed through the zoom drive tube 16. The rotary connecting member 21 fixed to the cam ring 20 provided on the inner side of the fixed cylinder 10 is engaged. The cam ring 20 is formed with a cam groove 20e that engages with a cam pin 10d protruding from the inside of the fixed cylinder 10.

  According to the above structure, when the zoom operation ring 18 is rotated, the zoom driving cylinder 16 is rotated by the action of the driving force transmission pin 19, and the first group lens sliding cylinder 11 is moved in the front-rear direction by the action of the rotation and the cam pin 15. It moves in the direction along the optical axis AX. Further, when the zoom driving cylinder 16 is rotated by the rotation of the zoom operation ring 18, this rotational force is transmitted to the cam ring 20 via the rotary connecting member 21, so that the cam ring 20 moves in the front-rear direction while rotating. The zoom guide tube 22 moves in the front-rear direction together with the zoom drive tube 16 without rotating.

  A cover cylinder 17 is provided between the zoom operation ring 18 and the first group lens sliding cylinder 11. As shown in FIGS. 2 and 3, the cover cylinder 17 moves in the front-rear direction in accordance with the first group lens sliding cylinder 11, and seals between the zoom operation ring 18 and the first group lens sliding cylinder 11. It stops and prevents intrusion of dust into the lens barrel 100.

  FIG. 4 is a view showing the vicinity of the second group lens sliding cylinder 12 in an extracted manner. As shown in FIG. 4, the second group lens sliding cylinder 12 is provided so as to surround the holding cylinder 24 that holds the second group lens L <b> 2, the holding ring 26 fixed to the holding cylinder 24, and the outer periphery of the holding cylinder 24. Engaging cylinder 28. The holding cylinder 24 and the pressing ring 26 are fixed by screwing or the like, and sandwich the outer edge portion of the second group lens L2.

  The engagement cylinder 28 cantileverly supports the two guide bars 30A and 30B. These two guide bars 30A and 30B are disposed at symmetrical positions (positions facing 180 °) across the optical axis AX.

  The guide bar 30A includes a shaft portion 30A1 and a fitting portion 30A2 provided at a rear end portion of the shaft portion 30A1 and having an outer diameter set larger than that of the shaft portion 30A1. Most of the guide bar 30A is slidably inserted into the guide pipe 36A. Further, the guide bar 30A is in a state of passing through the bearing portion 43 provided in the projection portion 33a in the shaft portion 30A1 (a state of being fitted in a through hole formed in the bearing portion 43). A non-contact state is maintained between the shaft portion 30A1 and the guide pipe 36A.

  The fitting portion 30A2 is fitted with the guide pipe 36A. That is, the outer diameter of the fitting portion 30A2 is set to be substantially the same as the inner diameter of the guide pipe 36A. Here, “substantially the same diameter” means a dimension in which a gap that does not hinder the sliding of the fitting portion 30A2 is formed between the guide pipe 36A and the fitting portion 30A2. Thus, in this embodiment, since the shaft portion 30A1 of the guide bar 30A is fitted in the through hole of the bearing portion 43 and the fitting portion 30A2 is fitted in the guide pipe 36A, the guide bar 30A is The bearing portion 43 and the guide pipe 36A guide the optical axis AX. In addition, the guide bar 30A is fitted (contacted) to the bearing portion 43 and a position away from the bearing portion 43 of the guide pipe 36A, and therefore the inclination of the guide bar 30A due to the weight of the second group lens sliding cylinder 12 is increased. The optical axis collapse of the second group lens L2 and the like are suppressed.

  As the material of the guide bar 30A, stainless steel or the like can be used as in the case of the guide pipes 36A and 36B. Here, in order to smoothly slide the guide bar 30A, for example, a fitting exterior (for example, Teflon (registered trademark) -containing composite plating) is applied to the fitting hole 30A2 and the through hole portion of the bearing portion 43. And so on. Moreover, it is good also as using the material (polyacetal resin etc.) of a low friction coefficient as a material of the bearing part 43 and fitting part 30A2. Thereby, the zooming and focusing operations can be smoothed, and the durability of the guide bar 30A and the bearing portion 43 can be improved.

  The guide bar 30 </ b> B has a cylindrical shape, and one end thereof is fixed to the engagement cylinder 28. The outer diameter of the guide bar 30B is set smaller than the inner diameter of the guide pipe 36B, and most of the guide bar 30B is inserted into the guide pipe 36B. The guide bar 30B is also inserted into an oblong hole 44a formed in the bearing portion 44 provided in the protrusion 33c. As the material of the guide bar 30B, stainless steel or the like can be used as in the case of the guide bar 30A.

  FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 shows a state where the second group lens sliding cylinder 12 has moved forward from the state of FIG. As shown in FIG. 5, the width of the oval hole 44 a of the bearing portion 44 is substantially the same as the diameter of the guide bar 30 </ b> B, that is, a gap that does not hinder the sliding of the second group lens sliding cylinder 12 is formed. Set to dimensions. Further, the length of the guide bar 30B is shorter than the length of the guide bar 30A as shown in FIG. 4, and the oval hole is formed even when the second group lens sliding cylinder 12 slides as shown in FIG. The length is set such that it can be kept in contact with 44a. In this embodiment, the guide bar 30B and the oblong hole 44a are in contact with each other, so that the movement in the rotational direction around the guide pipe 36A of the second group lens sliding cylinder 12 is suppressed. Note that a U-shaped groove may be formed in the bearing portion 44 instead of the oval hole 44a. As for the bearing portion 44, similarly to the bearing portion 43, the oval hole 44 a is provided with a lubricating exterior (for example, Teflon (registered trademark) -containing composite plating) or a low friction material for the bearing portion 44. A coefficient material (polyacetal resin or the like) may be used.

  As a material for the guide bars 30A and 30B, a material having high strength and light weight, such as stainless steel, can be used. The guide bars 30A and 30B are fixed to the engaging cylinder 28 through a process such as adhesion or press fitting. Further, as the material of the guide pipes 36A and 36B, stainless steel or the like can be used as in the case of the guide bars 30A and 30B.

  A protruding follower 28 a is formed on a part of the outer peripheral surface of the engagement cylinder 28. The follower 28a is engaged with a circumferential groove 32c of an interlocking ring 32 provided outside the engagement cylinder 28. The follower 28a is disposed in the vicinity of the guide bar 30A, that is, in the vicinity of an extension shaft obtained by extending the central axis of the guide bar 30A.

  The interlocking ring 32 in which the circumferential groove 32c is formed further includes an interlocking groove 32a and a cam follower 32b. One end of an interlocking key 34 having a substantially L-shape is engaged with the interlocking groove 32a. The interlocking key 34 is connected to a focus ring 37 provided on the outer peripheral portion of the fixed cylinder 10 shown in FIGS. 2 and 3, and the optical axis AX is rotated along with the rotation of the focus ring 37 around the optical axis AX. It moves in the rotation direction around the center. Thus, when the interlocking key 34 moves in the rotation direction around the optical axis AX, the interlocking ring 32 rotates around the optical axis AX. The interlock key 34 is also connected to a motor 38 provided in the motor chamber 10 c of the fixed cylinder 10. Therefore, the interlocking ring 32 also rotates around the optical axis AX by the movement of the interlocking key 34 in the rotational direction around the optical axis AX accompanying the rotational operation of the motor 38.

  The cam follower 32 b is engaged with a cam groove 20 b formed in the cam ring 20. Therefore, when the interlocking ring 32 rotates, the interlocking ring 32 and members connected to the interlocking ring 32 (the second group lens sliding cylinder 12, the guide bars 30A and 30B, the second group lens L2) are connected to the cam groove 20b and the cam follower. By the action of 32b, it moves in the front-back direction. In this movement in the front-rear direction, the interlocking ring 32 moves in the front-rear direction while rotating around the optical axis AX. Since it is regulated, the second group lens sliding cylinder 12 and the second group lens L2 connected to the guide bars 30A and 30B move in the front-rear direction without rotating. The cam follower 32b is disposed in the vicinity of the guide bar 30A, that is, in the vicinity of an extension shaft obtained by extending the central axis of the guide bar 30A.

  FIG. 7 is a view showing the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 and the vicinity thereof. As shown in FIG. 7, the third and fifth group lens sliding cylinders 13 hold the third group lens L3 and the fifth group lens L5 at a predetermined interval in the optical axis AX direction.

  The third and fifth group lens sliding cylinders 13 have two engaging portions 13a and 13b that engage with the guide pipe 36A, and one engaging portion 13c that engages with the guide pipe 36B. The fourth group lens sliding cylinder 14 is provided with two engaging portions 14a and 14b that engage with the guide pipe 36A and an engaging portion 14c that engages with the guide pipe 36B.

  The engaging portions 13b, 13a, 14a, and 14b have circular through holes. The through hole has substantially the same diameter as the guide pipe 36A. The third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 have the guide pipe 36A in a state where the guide pipe 36A is inserted into the through hole. Is guided in the front-rear direction. Here, “substantially the same diameter” means a dimension in which a gap is formed between the guide pipe 36 </ b> A and the through-hole so as not to hinder the sliding of the third and fifth group lens sliding cylinders 13. The guide pipe 36 </ b> A instructs the weights of the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14. On the other hand, the engaging portions 13c and 14c have U-shaped grooves. The width of the U-shaped groove is substantially the same as the diameter of the guide pipe 36B, that is, a dimension that forms a gap that does not interfere with the sliding of the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14. Is set. In the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14, the U-shaped groove is engaged with the guide pipe 36 </ b> B, so that the movement in the rotation direction around the guide pipe 36 </ b> A is suppressed. The engaging portions 13c and 14c may be formed with long circular holes in the radial direction instead of the U-shaped grooves.

  Next, based on FIG. 2, FIG. 3, etc., the movement operation of the lenses L2 to L5 when performing the zoom operation (zooming) and the movement operation of the lenses L2 to L5 when focusing (focusing) will be described. To do.

  First, the movement operation of each lens during zooming will be described. Here, the operation from the state in which the lens barrel 100 is at the wide-angle end (FIG. 2) to the zooming to the telephoto end (FIG. 3) will be described.

  When the zoom operation ring 18 (see FIG. 2 and the like) is rotated by the user from the state of FIG. 2, the cam ring 20 is rotated through the rotary connecting member 21 and the like as described above. Along with this rotation, the rotational force and the forward moving force also act on the interlocking ring 32 via the cam follower 32b. The interlocking ring 32 is operated by the interlocking key 34 (fixed state) that engages with the interlocking groove 32a. Since it is guided only in the front-rear direction, it goes straight ahead without rotating. As the interlocking ring 32 moves straight, the engagement cylinder 28 (that is, the second group lens sliding cylinder 12) and the second group lens L2 that engage with the interlocking ring 32 move in the forward direction. While the second group lens sliding cylinder 12 moves forward, the guide bar 30B continues to be in contact with the oval hole 44a portion of the bearing portion 44, and the guide bar 30A is inserted into the guide pipe 36A. (See FIGS. 4 and 6).

  Further, the rotation of the cam ring 20 is caused by the forward movement of the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 (3 to 5 group lenses L3 to L5) engaged via the cam followers 35 and 45. Move to. The moving distance between the lenses L3 and L5 and the lens L4 varies depending on the formation direction (angle) of the cam grooves 20c and 20d with which the cam follower 35 and the cam follower 45 are engaged. Since the cam ring 20 itself moves in the forward direction, the actual moving distance of each of the lenses L3 to L5 is the total distance of the moving distance of the cam ring 20 and the moving distance of the cam followers 35 and 45 by the cam grooves 20c and 20d. Become.

  As described above, during zooming, each of the second to fifth group lenses L2 to L5 (and the first group lens L1 which is not illustrated and illustrated) is separately moved forward in accordance with the rotation operation of the zoom operation ring 18. (However, the lenses L3 and L5 have the same distance).

  Next, the movement operation of each lens during focusing will be described.

  First, when the focus ring 37 is rotated by the user or the motor 38 is driven to rotate, the interlock key 34 moves in the rotation direction around the optical axis AX, as described above, the interlock key 34 The interlocking ring 32 to be engaged rotates around the optical axis AX. By this rotation, the interlocking ring 32 moves in the forward direction along the cam follower 32 b along the cam groove 20 b of the cam ring 20. Then, by the movement of the interlocking ring 32 in the rotational direction and the forward direction, the engaging cylinder 28 (that is, the second lens group sliding cylinder 12) having the follower 28a engaged with the circumferential groove 32c of the interlocking ring 32 and the second lens group L2 Will also move forward. Here, since the cam follower 32b and the follower 28a are disposed in the vicinity of the guide bar 30A, the driving force in the optical axis AX direction can be efficiently applied to the interlocking ring 32 and the engagement cylinder 28.

  On the other hand, since the cam ring 20 is in a non-rotating fixed state, the third to fifth lens groups L3 to L5 do not move in the front (rear) direction. Further, the first group lens L1, which is not described and illustrated, does not move in the front (rear) direction.

  In this way, during focusing, only the second group lens L2 moves in the front (rear) direction as the interlocking key 34 rotates. In this case, the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 are not in direct contact with the guide bars 30A and 30B fixed to the second group lens sliding cylinder 12. The movement of the sliding cylinder 12 in the front (rear) direction is not obstructed by the third and fifth lens group sliding cylinders 13 and the fourth lens group sliding cylinder 14.

  Note that the rotation of the motor 38 during focusing is controlled by the main control unit 250 in FIG. 1 based on the detection result of the focus detection device 230. That is, autofocus is executed by the rotation control of the motor 38 by the main control unit 250. Note that the lens barrel 100 and the imaging unit 200 are electrically connected by a connection terminal provided between the lens barrel 100 and the imaging unit 200, and thereby, the lens barrel 100 (for example, Electric power is supplied to the motor 38 and the like from the imaging unit 200 side.

  As described above, according to the present embodiment, the second group lens sliding cylinder 12 slides in the optical axis AX direction by the sliding operation along the inner peripheral surface of the guide pipe 36A of the guide bar 30A, and the third and fifth groups. Since the lens sliding cylinder 13 and the fourth group lens sliding cylinder 14 slide in the optical axis AX direction along the outer peripheral surface of the guide pipe 36B, the lens sliding cylinders 12, 13, and 14 are moved along the same member. Can be moved. Thereby, it is possible to simplify the structure in the lens barrel 100. In this embodiment, the guide bar 30A has a shaft portion 30A1 whose outer peripheral surface is in contact with the bearing portion 43, and a fitting portion 30A2 that fits with the guide pipe 36A. The diameter is set smaller than the outer diameter of the fitting portion 30A2. Thereby, the guide bar 30A is fitted to the guide pipe 36A only in the fitting portion 30A2, and the shaft portion 30A1 is not fitted to the guide pipe 36A. Even if the straightness of the rear portion of the contacting portion is poor, the influence of the straightness on the sliding operation of the guide bar 30A can be reduced. Thereby, the malfunction in the sliding operation | movement of the 2 group lens sliding cylinder 12 is suppressed. Further, the processing of the guide bar 30A is facilitated, and the processing cost is reduced. Furthermore, since it is possible to reduce the weight of the guide bar 30A, it is possible to reduce the weight of the lens barrel 100.

  Further, according to the present embodiment, the guide bar 30 </ b> B extending in the optical axis AX direction is fixed to the second group lens sliding cylinder 12 and is in contact with the fixed cylinder 10, thereby fixing the second group lens sliding cylinder 12. The movement operation (rotation operation) around the optical axis AX with respect to the tube 10 is restricted. The guide bar 30B has such a length that it can be kept in contact with the oval hole 44a when the second group lens sliding cylinder 12 slides. That is, since the guide bar 30B can be made shorter than the guide bar 30A, the lens barrel 100 can be reduced in weight compared to the case where the guide bar 30B has the same length as the guide bar 30A. . Furthermore, the processing cost of the guide bar 30B and the material cost can be reduced.

  In the present embodiment, the fixed cylinder 10 supports the guide pipe 36B extending in the optical axis AX direction, and the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 are guided by the guide pipe 36A. While being guided in the axial direction, the movement operation (rotation operation) in the direction around the optical axis AX is restricted by contacting the guide pipe 36B. As a result, the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 are guided in the front-rear direction without contact with the guide bars 30A and 30B. Therefore, the movement of the second group lens sliding cylinder 12 is not prevented by the third and fifth group lens sliding cylinder 13 and the fourth group lens sliding cylinder 14. As a result, the force required to move the second group lens sliding cylinder 12 can be reduced, so that the burden on the motor 38 or the user who rotates the focus ring 37 can be reduced.

  In the present embodiment, the guide bar 30B is inserted into the guide pipe 36B, and the outer diameter of the guide bar 30B is set smaller than the inner diameter of the guide pipe 36B. And the sliding operation of the second group lens sliding cylinder 12 can be prevented. Furthermore, as compared with the case where the guide pipe 36B and the guide bar 30B are provided separately, the structure in the lens barrel 100 can be simplified and the space efficiency can be improved.

  In the present embodiment, the shaft portion 30A1 is supported by the engagement tube 28, and the fitting portion 30A2 is provided at the rear end of the guide bar 30A. Thereby, since the distance between the bearing part 43 and fitting part 30A2 can be taken long, with respect to guide pipe 36A resulting from fitting with the outer diameter of fitting part 30A2, and the inner diameter of guide pipe 36A It is possible to reduce the inclination of the guide bar 30A. Thereby, since the tilt of the second group lens sliding cylinder 12 with respect to the optical axis AX is reduced, it is possible to prevent deterioration of the optical performance.

  In the present embodiment, since the guide pipes 36A and 36B are disposed at positions facing each other by 180 degrees with respect to the optical axis AX of the lens barrel 100, the distance between the guide bars 30A and 30B can be made as large as possible. it can. As a result, it is possible to reduce the force required when the rotation of the second group lens sliding cylinder 12 around the optical axis AX direction is restricted by the guide bar 30B, thereby reducing the force and deformation applied to the guide bar 30B. can do.

  In the above embodiment, the fitting portion 30A2 is disposed at the end on the rear side of the guide bar 30A. However, the position at which the fitting portion 30A2 is disposed is not limited to the rear end of the guide bar 30A, and may be a position that does not hinder the sliding operation of the second group lens sliding cylinder 12.

  In the above-described embodiment, the case where the guide bar 30A is guided in the optical axis AX direction by the bearing 43 formed on the protrusion 33a of the fixed cylinder 10 contacting the outer peripheral surface of the guide bar 30A has been described. However, the present invention is not limited to this, and the guide bar 30A may be guided in the direction of the optical axis AX by adopting the configuration shown in FIG. 8 (Modifications 1 and 2).

  The shaft portion 30A1 and the fitting portion 30A2 may be formed by processing (cutting or the like) the same member, or the guide bar 30A may be manufactured by forming and bonding each portion with a different member. Also good.

  FIG. 8A shows a configuration according to the first modification. In the first modification, the bearing portion 43 is disposed not inside the protrusion 33a but inside the guide pipe 36A. FIG. 8B shows a configuration according to the second modification. In the modified example 2, the engagement cylinder 28 supports the fitting portion 30A2, and the shaft portion 30A1 and the bearing portion 43 can be kept in contact with each other even when the second group lens sliding cylinder 12 slides. The part 43 is arranged. As described above, the guide bar 30A can be guided in the optical axis AX direction by disposing the bearing portion 43 inside the guide pipe 36A instead of the protruding portion 33a.

  In the above embodiment, the guide bar 30B fixed to the second group lens sliding cylinder 12 comes into contact with the oblong hole 44a formed in the protrusion 33c of the fixed cylinder 10, so that the second group lens sliding cylinder The case where 12 rotation operations are regulated has been described. However, the present invention is not limited to this, and the rotation operation of the second group lens sliding cylinder 12 may be restricted by adopting the configuration shown in FIGS. 9 to 11 (Modifications 3 to 6).

  9A and 9B show a configuration according to the third modification. FIG. 9B is a cross-sectional view taken along line BB in FIG. In the third modification, a cap-like member 71 in which an oblong hole 71a is formed is provided on a part (front end) of the guide pipe 36B. Even in this case, since the guide bar 30B keeps in contact with the cap-like member 71 (the oblong hole 71a), it is possible to restrict the rotation operation of the second group lens sliding cylinder 12 as in the above embodiment. is there.

  10A and 10B show a configuration according to the fourth modification. In addition, FIG.10 (b) is CC sectional view taken on the line of Fig.10 (a). In Modification 4, instead of the guide pipe 36B of the above-described embodiment, a guide pipe 36B 'having a flat shape as a whole is employed. Even in this case, since the guide bar 30B and a part of the inner peripheral surface of the guide pipe 36B ′ are kept in contact with each other, the rotation operation of the second group lens sliding cylinder 12 can be restricted as in the above embodiment. It is. Even if the guide pipe 36B 'having a flat shape is adopted, there is no problem in the moving operation of the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14.

  FIG. 11A shows a configuration according to the fifth modification. In the modified example 5, the guide bar 30B is fixed to the protrusion 33c of the fixed cylinder 10. In the fifth modification, the U-shaped groove 28 h is provided in the engaging cylinder 28 of the second group lens sliding cylinder 12. In this case, the guide bar 30B is kept in contact with the U-shaped groove 28h while the second lens group sliding cylinder 12 moves in the front-rear direction. Even when the fifth modified example is adopted, the rotation operation of the second group lens sliding cylinder 12 can be restricted as in the above embodiment. The engaging cylinder 28 may be formed with an oval hole having the same function as the U-shaped groove instead of the U-shaped groove 28h. In FIG. 11A, the guide pipe 36B is used. However, the guide pipe 36B is not limited to this, and the guide pipe 36B is replaced by a rod-shaped member (guide bar) 36B ″ as in the sixth modification of FIG. 11B. It is good also as changing to.

  In addition, the said embodiment and the modifications 1-6 can be combined variously.

  In the embodiment described above, the guide bar 30B and the guide pipe 36B are arranged on the same axis. However, the present invention is not limited to this, and the guide bar 30B and the guide pipe 36B are arranged on different axes. May be. In this case, instead of the guide pipe 36B, a rod-like member (a member indicated by reference numeral “36B” ”in FIG. 11B) may be used.

  In the above embodiment, all of the first to fifth group lenses L1 to L5 move in the optical axis AX direction during zooming, and only the second group lens L2 moves in the optical axis AX direction during focusing. Although the case (inner focus type) has been described, the present invention is not limited to this. For example, at the time of focusing, any of the lenses L1, L3 to L5 other than the second group lens L2 may be moved in the optical axis AX direction. Among these methods, the method of performing focusing by moving the first group lens L1 is called a front lens payout method. Further, at the time of focusing, all the lenses of the first to fifth group lenses L1 to L5 or a plurality of these lenses may be moved. Among these, the method in which all the lenses are moved is called the entire extension method.

  In the above embodiment, the guide pipes 36A and 36B are configured separately from the fixed cylinder 10, and the guide pipes 36A and 36B are supported by the fixed cylinder 10. However, the present invention is not limited to this. . For example, the guide pipes 36A and 36B and the fixed cylinder 10 may be integrally formed.

  In the above embodiment, the case where the third lens group L3 and the fifth lens group L5 are held by the common lens sliding cylinder 13 is described. However, the present invention is not limited to this, and the third lens group L3 and the fifth lens group L5 are Alternatively, they may be held by separate lens sliding cylinders.

  In addition, the number of lenses and the lens arrangement in the above embodiment are examples. That is, the lens barrel includes a lens held by one lens sliding barrel fixed to the guide bar and a lens held by another lens sliding barrel that slides along the outer peripheral surface of the guide pipe. , At least it is sufficient.

  In the above-described embodiment, a member provided with a convex member (part) such as a cam follower or a follower is provided with a concave part such as a cam groove or a circumferential groove instead of the convex member (part). In addition, a member provided with a concave portion such as a cam groove or a circumferential groove may be provided with a convex member (portion) such as a cam follower or a follower instead of the concave portion.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Fixed cylinder 12 2 group lens sliding cylinder 13 3, 5 group lens sliding cylinder 14 4 group lens sliding cylinder 30A, 30B Guide bar 36A, 36B Guide pipe 30A1 Shaft part 30A2 Fitting part 43 Bearing part L2 2 group lens L3 3rd group lens L4 4th group lens L5 5th group lens 100 Lens barrel 200 Imaging unit 500 Camera

Claims (7)

A reference member;
A cylindrical member extending in a predetermined axial direction fixed to the reference member;
A shaft that has a fitting portion that fits into the tubular member, and a shaft portion that has an outer diameter smaller than the outer diameter of the fitting portion, and is inserted into the tubular member and slides in the predetermined axial direction Members,
A holding member that supports one end of the shaft member and that is guided in the predetermined axial direction by sliding the shaft member with respect to the cylindrical member;
A bearing portion that contacts the shaft portion of the shaft member and guides the shaft member in the predetermined axial direction;
A lens barrel comprising: A regulating member that extends in the predetermined axial direction, is in contact with or fixed to each of the holding member and the reference member, and regulates a movement operation of the holding member around the predetermined axis with respect to the reference member;
2. The lens mirror according to claim 1, wherein the regulating member has a length capable of continuing contact with at least one of the holding member and the reference member even when the holding member slides. Tube. The reference member has an extending member extending in the predetermined axial direction,
Either the cylindrical member or the extending member is used as a guide when the second holding member that holds the second optical member moves in the predetermined axial direction, and either the cylindrical member or the extending member is used. 3. The lens barrel according to claim 2, wherein the other restricts the movement operation of the second holding member in the direction around the predetermined axis by contacting the second holding member. 4. The extending member has a cylindrical shape,
The restricting member has a shaft shape, is fixed to the holding member, is inserted into the extending member,
The lens barrel according to claim 3, wherein an outer diameter of the regulating member is smaller than an inner diameter of the extending member.   The lens barrel according to any one of claims 1 to 4, wherein the shaft portion is located at one end supported by the holding member, and the fitting portion is located at the other end.   6. The lens mirror according to claim 1, wherein the cylindrical member and the extending member are arranged at positions facing each other by 180 degrees with respect to an optical axis of the lens barrel. Tube. The lens barrel according to any one of claims 1 to 6,
An imaging device comprising: an imaging unit that captures an image connected by the lens barrel.

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